Snowfield simulation fabric compatible with ultraviolet-visible light-near infrared broadband hyperspectrum and preparation method

Abstract

The invention discloses an ultraviolet-visible light-near infrared compatible broadband hyperspectral snowfield camouflage fabric, which is characterized in that the fabric comprises a high ultraviolet reflection coating and a 3D spacer fabric layer infiltrated with a moisture absorption coating, the raw materials of the high ultraviolet reflection coating comprise polyvinyl alcohol and an inorganic white powdery pigment, and the raw materials of the high ultraviolet reflection coating comprise polyvinyl alcohol and an inorganic white powdery pigment. The moisture absorption coating comprises a polymer coating and a water-absorbable metal salt layer. The invention further discloses a preparation method of the broadband hyperspectral snowfield camouflage fabric compatible with ultraviolet light, visible light and near infrared light and specific application of the fabric. The 3D spacer fabric serves as a base material, the moisture absorption coating is manufactured on the surface of the 3D spacer fabric firstly, then the high-ultraviolet-reflection coating is manufactured on one side or two sides of the fabric, the prepared spectrum simulation fabric has high ultraviolet reflectivity, obvious'moisture absorption valley (water peak) 'is also simulated at 1450 nm and 1930 nm, and snowfield camouflage in a broadband range can be better met.

Description

Technical Field

[0001] The invention belongs to the technical field of textile dyeing and finishing, and specifically relates to a snow simulation fabric compatible with ultraviolet-visible light-near infrared wide-band hyperspectral and a preparation method thereof. Background Art

[0003] Snow has a unique environment. Through the analysis of existing snow spectra, it is known that snow has three quite obvious spectral characteristics in the reflection spectrum of 350-2500nm, namely, the reflectivity at 350nm should be greater than 70%; the average reflectivity in the visible light band of 380-760nm should be above 75%; the reflectivity in the near-infrared band drops rapidly and two absorption valleys will be formed at 1450nm and 1930nm, which are called "water absorption valleys". Therefore, in order to achieve a good camouflage effect under snow conditions, not only the camouflage material is required to be white in the visible light region, but also its reflectivity to ultraviolet light must reach more than 70%. At the same time, the camouflage material should also have a similar water absorption valley in the near-infrared band, so that it can present a color effect similar to the snow background in the ultraviolet filter, and can cope with detection in a longer band range, so as to achieve the purpose of snow camouflage.

[0004] Domestic and foreign researchers have long studied snow camouflage materials for ultraviolet detection equipment, such as camouflage coatings made of white pigments such as sulfates, carbonates, and oxides of barium, calcium, and magnesium; camouflage fibers made by adding ZrO2 and TiO2 to spinning solutions; composite camouflage nets made of one or more mixtures of TiO2, magnesium titanate, silicates, or SiO2 as fillers, and research on white ultraviolet fluorescent dyes has also continued to emerge. However, these camouflage materials are mostly used for camouflage of military equipment such as vehicles and guns, and are not suitable for single-soldier combat. A patent has studied the light reflection properties of various white inorganic particles, pointing out that particles such as titanium dioxide, antimony trioxide, zinc oxide, and zinc sulfide have high reflectivity in the visible light band, but low reflectivity in the near-ultraviolet region, and do not have good snow camouflage performance.

[0005] At present, the materials with high UV reflection used in snow coatings include: barium sulfate, silicon dioxide, aluminum oxide, magnesium oxide and other inorganic white powdered pigments. Although they can reflect ultraviolet rays, the existing snow camouflage coatings on the market are generally used to reflect ultraviolet rays with a wavelength of 300 to 400 nanometers, and their average reflectivity is generally 60 to 65%. In addition, the coating performance of the coating is not good, and the bonding performance with the fabric is poor, resulting in that in actual use, the ultraviolet reflectivity of the existing snow coatings cannot even reach 60 to 65%. In order to solve the problem of low ultraviolet reflectivity of traditional snow camouflage equipment, Chinese invention patent CN201410217720.3 discloses a white printing slurry and its preparation method and use. Snow camouflage fabric is prepared by using silicon dioxide and magnesium oxide as pigments and water-based resin as adhesive through a paint printing process. Although the whiteness (visible light) and ultraviolet reflectivity of the prepared snow camouflage fabric can meet the requirements of simulating the snow background, its camouflage performance in the thermal infrared band is not involved, and its research only focuses on snow camouflage and protective textile materials for individual combat, and does not involve equipment camouflage.

[0006] In addition, existing relevant achievements in snow camouflage, such as CN 115895425 A, CN 117385652A and other patents, are mostly concentrated on the short-wave band of 380-1100nm, which is difficult to cope with hyperspectral detection technology in a wider band. Therefore, combining the high ultraviolet reflectance characteristics of the ultraviolet light region with the simulation of the "water absorption valley" has become a research focus for hyperspectral detection technology. Summary of the invention

[0007] In view of the above-mentioned problems, the purpose of the present invention is to provide a snow-simulating fabric and a preparation method that is compatible with ultraviolet-visible light-near infrared wide-band hyperspectral spectrum, so as to obtain a snow-simulating fabric with an ultraviolet reflectivity of more than 80% and capable of realizing detection in a wide band range of 350 to 2500nm, so as to solve the problems of existing snow-simulating fabrics such as low ultraviolet reflectivity and difficulty in realizing wide-band detection.

[0008] In view of the above-mentioned purpose, the present invention provides a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared and a preparation method thereof, using a material with low solar absorption rate and high infrared emissivity as a film-forming substance of the coating, adding an inorganic white powdered pigment with high ultraviolet reflectivity, and applying the coating to the surface of a 3D spacer fabric of different fabrics such as pure cotton, polyester, nylon, and polyester-cotton blends, so as to give it a good ultraviolet reflection effect and excellent coating performance; a polymer is generated by a cross-linking reaction of sodium alginate and calcium chloride solution at a certain temperature, and the moisture in the air is fixed to realize "water peak" simulation, so that the finally obtained fabric can achieve snow camouflage in a wide band range.

[0009] The present invention first provides a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared, wherein the fabric comprises a high ultraviolet reflective coating and a 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the raw materials of the high ultraviolet reflective coating comprise polyvinyl alcohol and an inorganic white powdery pigment, and the hygroscopic coating comprises a polymer coating and a water-absorbent metal salt layer; wherein the inorganic white powdery pigment comprises one or more of nano magnesium oxide, nano aluminum oxide, nano silicon dioxide, and barium sulfate, wherein the raw materials of the polymer coating comprise one or more of sodium alginate, sodium polyacrylate, sodium phosphorylated dextran, carboxylated modified cellulose, carboxylated modified sodium alginate, chitosan, and polyvinyl alcohol, and the water-absorbent metal salt comprises one or more of chlorides, sulfates, carbonates, and nitrates of calcium ions, zinc ions, and aluminum ions.

[0010] In one embodiment of the present invention, the fabric comprises a high UV reflective coating, a 3D spacer fabric layer impregnated with a hygroscopic coating, and a high UV reflective coating.

[0011] In one embodiment of the present invention, the fabric of the 3D spacer fabric includes pure cotton, polyester, nylon, and polyester-cotton blended fabric.

[0012] In one embodiment of the present invention, the high ultraviolet reflective coating is prepared by mixing a polyvinyl alcohol aqueous solution and an inorganic white powdered pigment, and applying the high ultraviolet reflective coating to the surface of the 3D spacer fabric.

[0013] In one embodiment of the present invention, the mass fraction of the polyvinyl alcohol aqueous solution is 1-5%.

[0014] In one embodiment of the present invention, the number average molecular weight of the polyvinyl alcohol is 50,000 to 150,000.

[0015] In one embodiment of the present invention, the coating method comprises at least one of spraying, calendering and roller coating.

[0016] In one embodiment of the present invention, the thickness of the high ultraviolet reflective coating is 0.01-5 nm.

[0017] In one embodiment of the present invention, in the high ultraviolet reflective coating, the particle size of the nano magnesium oxide is 20 to 50 nm, the particle size of the nano aluminum oxide is 10 to 50 nm, the particle size of the nano silicon dioxide is 10 to 50 nm, and the particle size of the barium sulfate is 200 to 500 nm.

[0018] In one embodiment of the present invention, in the high ultraviolet reflective coating, the mass ratio of the inorganic white powdered pigment to the polyvinyl alcohol aqueous solution is 1:25 to 1:1.

[0019] In one embodiment of the present invention, the preparation method of the polyvinyl alcohol aqueous solution is: pour polyvinyl alcohol into water at a temperature of 60-90°C, keep warm, stir thoroughly, make the polyvinyl alcohol fully and evenly dissolved, and then cool to 30°C.

[0020] In one embodiment of the present invention, the hygroscopic coating is obtained by first soaking the 3D spacer fabric in an aqueous solution of a polymer coating to prepare a polymer coating, drying it, and then soaking it in an absorbent metal salt aqueous solution to undergo a cross-linking reaction.

[0021] In one embodiment of the present invention, the mass fraction of the polymer coating in the aqueous solution of the polymer coating is 5 to 30%.

[0022] In one embodiment of the present invention, the thickness of the polymer coating is 0.01 to 5 nm.

[0023] In one embodiment of the present invention, the mass fraction of the water-absorbent metal salt in the aqueous solution of the water-absorbent metal salt is 10-50%.

[0024] In one embodiment of the present invention, the thickness of the water-absorbent metal salt layer is 0.01 to 5 nm.

[0025] The present invention also discloses a method for preparing the above-mentioned wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared, comprising the following steps:

[0026] (1) Preparation of high ultraviolet reflective coating: adding an inorganic white powdered pigment to a polyvinyl alcohol aqueous solution and stirring the mixture to obtain a high ultraviolet reflective coating;

[0027] (2) Preparation of a hygroscopic coating reaction solution: preparing a 5-30% by mass aqueous solution of a polymer coating and a 10-50% by mass aqueous solution of a water-absorbent metal salt;

[0028] (3) Preparation of water-absorbent transparent coating: The 3D spacer fabric is first immersed in an aqueous solution of a polymer coating, immersed for 30 to 60 minutes, and then dried in an oven at 60°C; then the fabric containing the polymer coating is immersed in a water-absorbent metal salt aqueous solution, cross-linked at 20 to 30°C for 30 to 60 minutes, and then dried;

[0029] (4) Preparation of high UV reflective coating: Apply high UV reflective coating on the surface of the hygroscopic coating and subject it to constant humidity treatment to obtain snow camouflage fabric.

[0030] In one embodiment of the present invention, the polymer coating is sodium alginate, and the water-absorbent metal salt is calcium chloride.

[0031] In one embodiment of the present invention, in step (4), the constant humidity treatment is to balance the fabric coated with the high ultraviolet reflective coating under a humidity condition of 60 to 90% for 2 to 5 hours.

[0032] The present invention also provides an application of the snow camouflage fabric in the field of snow camouflage.

[0033] In one embodiment of the present invention, the application includes the preparation of camouflage nets, combat uniforms, tank armor, information cabins and bunkers for camouflage of military machinery and individual combat.

[0034] Advantages and effects of the present invention:

[0035] (1) The present invention uses 3D spacer fabric as a substrate, first makes a hygroscopic coating on its surface, and then makes a high ultraviolet reflective coating on one side or both sides of the fabric. The prepared spectral simulation fabric not only has a high ultraviolet reflectivity, but also simulates obvious "moisture absorption valley (water peak)" at 1450nm and 1930nm, which can better meet the snow camouflage requirements in a wide band range.

[0036] (2) The present invention selects inorganic white powdered pigments such as nano-magnesium oxide, nano-aluminum oxide, nano-silicon dioxide, and barium sulfate as reflective materials for the high ultraviolet reflective coating, and combines them with polyvinyl alcohol to prepare the high ultraviolet reflective coating. The preparation of the high ultraviolet reflective coating significantly improves the ultraviolet reflectivity of the fabric, wherein the ultraviolet reflectivity of the preferred formula can reach more than 80%; and the high ultraviolet reflective coating of the present invention has better adhesion and is superior to commercially available coatings.

[0037] (3) The present invention selects polymer materials such as sodium alginate as the base material of the polymer coating. After the polymer coating is cross-linked with the water-absorbent metal salt, the fabric shows good near-infrared detection characteristics, that is, obvious "water peaks" appear at 1450nm and 1930nm, which can cope with detection in the 350-2500nm band.

[0038] (4) The 3D spacer fabric of the present invention can properly separate the "ultraviolet reflection layer" of the high-reflection coating and the "water peak simulation layer" of the hygroscopic coating, thereby reducing the mutual influence between the two and making them work together to simulate a wide-band snow spectrum curve covering ultraviolet-visible light-near infrared.

[0039] (5) The invention has developed a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared, which can achieve an ultraviolet reflectivity of more than 80% in the ultraviolet region and simulate the "water peak" at 1450nm and 1930nm to cope with detection in the 350-2500nm band. The camouflage fabric finally obtained can be widely used in various camouflages under the background of snow, not only for the camouflage of military equipment such as vehicles and guns, but also for the camouflage of camouflage nets, combat uniforms, tank armor, information cabins and bunkers in individual combat. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the processing flow of the wide-band hyperspectral snow camouflage fabric according to an embodiment of the present invention;

[0041] Figure 2 A fabric structure diagram of a wide-band hyperspectral snow camouflage fabric according to an embodiment of the present invention;

[0042] Figure 3 This is a spectral reflectance test chart of the wide-band hyperspectral snow camouflage fabric according to Example 1 of the present invention;

[0043] Figure 4 This is a spectral reflectance test chart of the high ultraviolet reflective fabric of Comparative Example 1 of the present invention;

[0044] Figure 5 This is a spectral reflectance test chart of the spectral simulation fabric of Comparative Example 2 of the present invention;

[0045] Figure 6 The spectral reflectance test graphs of the spectral simulation fabrics of Comparative Examples 3 to 6 of the present invention; DETAILED DESCRIPTION

[0046] The technical solution of the invention is described in detail below with reference to the accompanying drawings:

[0047] The effect testing method of the fabric obtained in the present invention is as follows: using a UV-visible near-infrared spectrophotometer (Lambda 950) produced by Perkin Elmer, USA, and adopting a Vis-NIR reflection spectrum test to measure the spectral reflection curve of the fabric.

[0048] Example 1

[0049] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-magnesium oxide, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0050] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0051] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0052] Step 2: Prepare a 5% sodium alginate solution and a 10% calcium chloride solution for standby use;

[0053] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution in step 2 for 30 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2, and cross-link it at room temperature for 30 minutes;

[0054] Step 4: After drying, apply the high ultraviolet reflective coating described in step 1 on the surface of one side of the fabric;

[0055] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0056] Example 2

[0057] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near infrared comprises a high ultraviolet reflective coating and a cotton 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0058] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0059] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0060] Step 2: prepare a 20% sodium alginate solution and a 20% calcium chloride solution for standby use;

[0061] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution in step 2 for 40 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2, and cross-link it at room temperature for 40 minutes;

[0062] Step 4: After drying, apply the high ultraviolet reflective coating of step 1 on one surface of the fabric;

[0063] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0064] Example 3

[0065] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0066] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0067] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0068] Step 2: prepare a 30% sodium alginate solution and a 30% calcium chloride solution for standby use;

[0069] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm×10 cm, fully soak it in the sodium alginate solution in step 2 for 50 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2 for cross-linking at room temperature for 50 minutes;

[0070] Step 4: After drying, apply the high ultraviolet reflective coating of step 1 on one surface of the fabric;

[0071] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0072] Example 4

[0073] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near infrared comprises a high ultraviolet reflective coating and a nylon 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and barium sulfate, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0074] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0075] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 110000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 300g of barium sulfate, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0076] Step 2: prepare a 5% sodium alginate solution and a 20% calcium chloride solution for standby use;

[0077] Step 3: Cut the nylon 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution in step 2 for 60 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2, and cross-link it at room temperature for 60 minutes;

[0078] Step 4: After drying, apply the high ultraviolet reflective coating of step 1 on one surface of the fabric;

[0079] Step 5: The obtained fabric is balanced under 90% humidity conditions for 5 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0080] Example 5

[0081] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano magnesium oxide, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0082] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0083] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0084] Step 2: Prepare a 5% sodium alginate solution and a 10% calcium chloride solution for standby use;

[0085] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution in step 2 for 30 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2, and cross-link it at room temperature for 30 minutes;

[0086] Step 4: After drying, the high ultraviolet reflective coating of step 1 is applied to both sides of the fabric;

[0087] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0088] Example 6

[0089] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a cotton 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0090] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0091] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0092] Step 2: prepare a 20% sodium alginate solution and a 20% calcium chloride solution for standby use;

[0093] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution in step 2 for 40 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2, and cross-link it at room temperature for 40 minutes;

[0094] Step 4: After drying, the high ultraviolet reflective coating of step 1 is applied to both sides of the fabric;

[0095] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0096] Example 7

[0097] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating, and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0098] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0099] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0100] Step 2: prepare a 30% sodium alginate solution and a 30% calcium chloride solution for standby use;

[0101] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm×10 cm, fully soak it in the sodium alginate solution in step 2 for 50 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 1, and cross-link it at room temperature for 50 minutes;

[0102] Step 4: After drying, the high ultraviolet reflective coating of step 1 is applied to both sides of the fabric;

[0103] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0104] Example 8

[0105] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a nylon 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano barium sulfate, and the hygroscopic coating comprises a cross-linked product of sodium alginate and calcium chloride.

[0106] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0107] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 110000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 300g of barium sulfate, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0108] Step 2: prepare a 5% sodium alginate solution and a 20% calcium chloride solution for standby use;

[0109] Step 3: Cut the nylon 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution in step 2 for 60 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2, and cross-link it at room temperature for 60 minutes;

[0110] Step 4: After drying, the high ultraviolet reflective coating of step 1 is applied to both sides of the fabric;

[0111] Step 5: The obtained fabric is balanced under 90% humidity conditions for 5 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0112] Example 9

[0113] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near infrared comprises a high ultraviolet reflective coating and a polyester 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano magnesium oxide, and the hygroscopic coating comprises a cross-linked product of sodium polyacrylate and calcium chloride.

[0114] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0115] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0116] Step 2: prepare a 5% sodium polyacrylate solution and a 10% calcium chloride solution for standby use;

[0117] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the sodium polyacrylate solution in step 2 for 30 minutes, dry it in an oven at 60°C, and then soak it in the calcium chloride solution in step 2 to crosslink it at room temperature for 30 minutes;

[0118] Step 4: After drying, apply the high ultraviolet reflective coating of step 1 on one side of the fabric;

[0119] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0120] Example 10

[0121] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near infrared comprises a high ultraviolet reflective coating and a cotton 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of sodium polyacrylate and calcium sulfate.

[0122] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0123] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0124] Step 2: prepare a 20% sodium polyacrylate solution and a 20% calcium sulfate solution for standby use;

[0125] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm×10 cm, fully soak it in the sodium polyacrylate solution of step 2 for 40 minutes, dry it in an oven at 60°C, and then soak it in the calcium sulfate solution of step 2 for cross-linking at room temperature for 40 minutes;

[0126] Step 4: After drying, apply the high ultraviolet reflective coating of step 1 on one side of the fabric;

[0127] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0128] Embodiment 11

[0129] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of sodium polyacrylate and calcium nitrate.

[0130] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0131] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0132] Step 2: prepare a 30% sodium polyacrylate solution and a 30% calcium nitrate solution for standby use;

[0133] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm×10 cm, fully soak it in the sodium polyacrylate solution of step 2 for 50 minutes, dry it in an oven at 60°C, and then soak it in the calcium nitrate solution of step 2 for cross-linking at room temperature for 50 minutes;

[0134] Step 4: After drying, apply the high ultraviolet reflective coating of step 1 on one side of the fabric;

[0135] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0136] Example 12

[0137] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano magnesium oxide, and the hygroscopic coating comprises a cross-linked product of sodium polyacrylate and calcium chloride.

[0138] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0139] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0140] Step 2: prepare a 5% sodium polyacrylate solution and a 10% calcium chloride solution for standby use;

[0141] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a sodium polyacrylate solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0142] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0143] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0144] Embodiment 13

[0145] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating, a cotton 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of sodium polyacrylate and calcium sulfate.

[0146] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0147] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0148] Step 2: prepare a 20% sodium polyacrylate solution and a 20% calcium sulfate solution for standby use;

[0149] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a sodium polyacrylate solution for 40 minutes, dry it in an oven at 60°C, and then soak it in a calcium sulfate solution for cross-linking at room temperature for 40 minutes;

[0150] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0151] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0152] Embodiment 14

[0153] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of sodium polyacrylate and calcium nitrate.

[0154] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0155] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0156] Step 2: prepare a 30% sodium polyacrylate solution and a 30% calcium nitrate solution for standby use;

[0157] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a sodium polyacrylate solution for 50 minutes, dry it in an oven at 60°C, and then soak it in a calcium nitrate solution for cross-linking at room temperature for 50 minutes;

[0158] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0159] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0160] Embodiment 15

[0161] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-magnesium oxide, and the hygroscopic coating comprises a cross-linked product of phosphorylated sodium dextran and calcium chloride.

[0162] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0163] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0164] Step 2: prepare a 5% by mass solution of sodium phosphated dextran and a 10% by mass solution of calcium chloride for standby use;

[0165] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the phosphorylated dextran sodium solution for 30 minutes, dry it in a 60°C oven, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0166] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0167] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0168] Example 16

[0169] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a cotton 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of phosphorylated sodium dextran and calcium sulfate.

[0170] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0171] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0172] Step 2: prepare 20% by mass of sodium phosphated dextran solution and 20% by mass of calcium sulfate solution for standby use;

[0173] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in phosphorylated dextran sodium solution for 40 minutes, dry it in a 60°C oven, and then soak it in a calcium sulfate solution for cross-linking at room temperature for 40 minutes;

[0174] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0175] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0176] Embodiment 17

[0177] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of phosphorylated sodium dextran and calcium nitrate.

[0178] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0179] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0180] Step 2: prepare a 30% by mass solution of sodium phosphated dextran and a 30% by mass solution of calcium nitrate for standby use;

[0181] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the phosphorylated sodium dextran solution for 50 minutes, dry it in an oven at 60°C, and then soak it in a calcium nitrate solution for cross-linking at room temperature for 50 minutes;

[0182] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0183] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0184] Embodiment 18

[0185] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano magnesium oxide, and the hygroscopic coating comprises a cross-linked product of phosphorylated sodium dextran and calcium chloride.

[0186] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0187] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0188] Step 2: prepare a 5% by mass solution of sodium phosphated dextran and a 10% by mass solution of calcium chloride for standby use;

[0189] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the phosphorylated dextran sodium solution for 30 minutes, dry it in a 60°C oven, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0190] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0191] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0192] Embodiment 19

[0193] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating, a cotton 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of sodium phosphorylated dextran and calcium sulfate.

[0194] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0195] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0196] Step 2: prepare 20% by mass of sodium phosphated dextran solution and 20% by mass of calcium sulfate solution for standby use;

[0197] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the phosphorylated dextran sodium solution for 40 minutes, dry it in a 60°C oven, and then soak it in a calcium sulfate solution for cross-linking at room temperature for 40 minutes;

[0198] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0199] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0200] Embodiment 20

[0201] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating, and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of phosphorylated sodium dextran and calcium nitrate.

[0202] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0203] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0204] Step 2: prepare a 30% by mass solution of sodium phosphated dextran and a 30% by mass solution of calcium nitrate for standby use;

[0205] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the phosphorylated sodium dextran solution for 50 minutes, dry it in an oven at 60°C, and then soak it in a calcium nitrate solution for cross-linking at room temperature for 50 minutes;

[0206] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0207] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0208] Embodiment 21

[0209] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-magnesium oxide, and the hygroscopic coating comprises a cross-linked product of polymethacrylic acid and calcium chloride.

[0210] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0211] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0212] Step 2: prepare a 5% by mass polymethacrylic acid solution and a 10% by mass calcium chloride solution for standby use;

[0213] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a polymethacrylic acid solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0214] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0215] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0216] Embodiment 22

[0217] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a cotton 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of polymethacrylic acid and calcium sulfate.

[0218] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0219] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0220] Step 2: prepare a 20% by mass polymethacrylic acid solution and a 20% by mass calcium sulfate solution for standby use;

[0221] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a polymethacrylic acid solution for 40 minutes, dry it in an oven at 60°C, and then soak it in a calcium sulfate solution for cross-linking at room temperature for 40 minutes;

[0222] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0223] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0224] Embodiment 23

[0225] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of polymethacrylic acid and calcium nitrate.

[0226] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0227] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0228] Step 2: prepare a 30% by mass polymethacrylic acid solution and a 30% by mass calcium nitrate solution for standby use;

[0229] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a polymethacrylic acid solution for 50 minutes, dry it in an oven at 60°C, and then soak it in a calcium nitrate solution for cross-linking at room temperature for 50 minutes;

[0230] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0231] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0232] Embodiment 24

[0233] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano magnesium oxide, and the hygroscopic coating comprises a cross-linked product of polymethacrylic acid and calcium chloride.

[0234] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0235] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0236] Step 2: prepare a 5% by mass polymethacrylic acid solution and a 10% by mass calcium chloride solution for standby use;

[0237] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a polymethacrylic acid solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0238] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0239] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0240] Embodiment 25

[0241] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a cotton 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of polymethacrylic acid and calcium sulfate.

[0242] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0243] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0244] Step 2: prepare a 20% by mass polymethacrylic acid solution and a 20% by mass calcium sulfate solution for standby use;

[0245] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a polymethacrylic acid solution for 40 minutes, dry it in an oven at 60°C, and then soak it in a calcium sulfate solution for cross-linking at room temperature for 40 minutes;

[0246] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0247] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0248] Embodiment 26

[0249] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of polymethacrylic acid and calcium nitrate.

[0250] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0251] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0252] Step 2: prepare a 30% by mass polymethacrylic acid solution and a 30% by mass calcium nitrate solution for standby use;

[0253] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in a polymethacrylic acid solution for 50 minutes, dry it in an oven at 60°C, and then soak it in a calcium nitrate solution for cross-linking at room temperature for 50 minutes;

[0254] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0255] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0256] Embodiment 27

[0257] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near infrared comprises a high ultraviolet reflective coating and a polyester 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano magnesium oxide, and the hygroscopic coating comprises a cross-linked product of carboxymethyl cellulose and calcium chloride.

[0258] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0259] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0260] Step 2: prepare a 5% by mass carboxymethyl cellulose solution and a 10% by mass calcium chloride solution for standby use;

[0261] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the carboxymethyl cellulose solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0262] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0263] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0264] Embodiment 28

[0265] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a cotton 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of carboxymethyl cellulose and calcium sulfate.

[0266] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0267] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0268] Step 2: prepare a 20% carboxymethyl cellulose solution and a 20% calcium sulfate solution for standby use;

[0269] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the carboxymethyl cellulose solution for 40 minutes, dry it in an oven at 60°C, and then soak it in a calcium sulfate solution for cross-linking at room temperature for 40 minutes;

[0270] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0271] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0272] Embodiment 29

[0273] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating and a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of carboxymethyl cellulose and calcium nitrate.

[0274] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0275] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0276] Step 2: prepare a 30% by mass carboxymethyl cellulose solution and a 30% by mass calcium nitrate solution for standby use;

[0277] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the carboxymethyl cellulose solution for 50 minutes, dry it in an oven at 60°C, and then soak it in a calcium nitrate solution for cross-linking at room temperature for 50 minutes;

[0278] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0279] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0280] Embodiment 30

[0281] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a polyester 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano magnesium oxide, and the hygroscopic coating comprises a cross-linked product of carboxymethyl cellulose and calcium chloride.

[0282] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0283] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0284] Step 2: prepare a 5% by mass carboxymethyl cellulose solution and a 10% by mass calcium chloride solution for standby use;

[0285] Step 3: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the carboxymethyl cellulose solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0286] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0287] Step 5: The obtained fabric is balanced under 60% humidity conditions for 2 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0288] Embodiment 31

[0289] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises a high ultraviolet reflective coating, a cotton 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-aluminum oxide, and the hygroscopic coating comprises a cross-linked product of carboxymethyl cellulose and calcium sulfate.

[0290] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0291] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 70,000 to 990g of water at a temperature of 70°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 100g of nano-alumina, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0292] Step 2: prepare a 20% carboxymethyl cellulose solution and a 20% calcium sulfate solution for standby use;

[0293] Step 3: Cut the cotton 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the carboxymethyl cellulose solution for 40 minutes, dry it in an oven at 60°C, and then soak it in a calcium sulfate solution for cross-linking at room temperature for 40 minutes;

[0294] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0295] Step 5: The obtained fabric is balanced under 70% humidity conditions for 3 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0296] Embodiment 32

[0297] A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet, visible light and near-infrared comprises a high ultraviolet reflective coating, a polyester-cotton blended 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, wherein the high ultraviolet reflective coating comprises polyvinyl alcohol and nano-silicon dioxide, and the hygroscopic coating comprises a cross-linked product of carboxymethyl cellulose and calcium nitrate.

[0298] A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared comprises the following steps:

[0299] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 90,000 to 990g of water at a temperature of 80°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 150g of nano-silicon dioxide, stir evenly, and prepare a high ultraviolet reflective coating for standby use;

[0300] Step 2: prepare a 30% by mass carboxymethyl cellulose solution and a 30% by mass calcium nitrate solution for standby use;

[0301] Step 3: Cut the polyester-cotton blended 3D spacer fabric into a size of 10 cm × 10 cm, fully soak it in the carboxymethyl cellulose solution for 50 minutes, dry it in an oven at 60°C, and then soak it in a calcium nitrate solution for cross-linking at room temperature for 50 minutes;

[0302] Step 4: After drying, apply high UV reflective coating on both sides of the fabric;

[0303] Step 5: The obtained fabric is balanced under 80% humidity conditions for 4 hours to obtain a wide-band hyperspectral snow camouflage fabric.

[0304] Comparative Example 1

[0305] A method for preparing a high ultraviolet reflective fabric comprises the following steps:

[0306] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, allow the polyvinyl alcohol to fully dissolve evenly, then cool to 30°C, add 200g of nano magnesium oxide, stir evenly, and prepare a high ultraviolet reflective coating;

[0307] Step 2: Apply high UV reflective coating on one side of the polyester 3D fabric cut to a size of 10 cm × 10 cm;

[0308] Step 3: The obtained fabric was balanced under 60% humidity conditions for 2 hours to obtain the fabric of Control Example 1.

[0309] Comparative Example 2

[0310] A method for preparing a wide spectrum simulated fabric comprises the following steps:

[0311] Step 1: prepare a 5% sodium alginate solution and a 10% calcium chloride solution for standby use;

[0312] Step 2: Cut the polyester 3D spacer fabric into a size of 10 cm × 10 cm, soak it in a sodium alginate solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking for 30 minutes;

[0313] Step 3: The obtained fabric was balanced under 60% humidity conditions for 2 hours to obtain the fabric of Control Example 2.

[0314] Comparative Example 3

[0315] A method for preparing a spectrum simulation fabric comprises the following steps:

[0316] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0317] Step 2: Prepare a 5% sodium alginate solution and a 10% calcium chloride solution for standby use;

[0318] Step 3: Cut the single-layer cotton fabric into a size of 10 cm × 10 cm, soak it in the sodium alginate solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0319] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0320] Step 5: The obtained fabric was balanced under 60% humidity conditions for 2 hours to obtain the fabric of Control Example 3.

[0321] Comparative Example 4

[0322] A method for preparing a spectrum simulation fabric comprises the following steps:

[0323] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0324] Step 2: Prepare a 5% sodium alginate solution and a 10% calcium chloride solution for standby use;

[0325] Step 3: Cut the single-layer polyester fabric into a size of 10 cm × 10 cm, soak it in the sodium alginate solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0326] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0327] Step 5: The obtained fabric was balanced under 60% humidity conditions for 2 hours to obtain the fabric of Control Example 4.

[0328] Comparative Example 5

[0329] A method for preparing a spectrum simulation fabric comprises the following steps:

[0330] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0331] Step 2: Prepare a 5% sodium alginate solution and a 10% calcium chloride solution for standby use;

[0332] Step 3: Cut the single-layer polyester-cotton blended fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0333] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0334] Step 5: The obtained fabric was balanced under 60% humidity conditions for 2 hours to obtain the fabric of Control Example 5.

[0335] Comparative Example 6

[0336] A method for preparing a spectrum simulation fabric comprises the following steps:

[0337] Step 1: add 10g of polyvinyl alcohol with a number average molecular weight of 50,000 to 990g of water at a temperature of 60°C, keep warm, stir thoroughly, and cool to 30°C to make the polyvinyl alcohol fully and evenly dissolved, add 200g of nano magnesium oxide, stir well, and prepare a high ultraviolet reflective coating for standby use;

[0338] Step 2: Prepare a 5% sodium alginate solution and a 10% calcium chloride solution for standby use;

[0339] Step 3: Cut the single-layer nylon fabric into a size of 10 cm × 10 cm, fully soak it in the sodium alginate solution for 30 minutes, dry it in an oven at 60°C, and then soak it in a calcium chloride solution for cross-linking at room temperature for 30 minutes;

[0340] Step 4: Apply high UV reflective coating on one side of the fabric after drying;

[0341] Step 5: The obtained fabric was balanced under 60% humidity conditions for 2 hours to obtain the fabric of Control Example 6.

[0342] By comparing the spectral curves of the fabrics in Example 1 with those in Control Examples 1 and 2, it can be seen that a wide-band hyperspectral snow camouflage fabric covering ultraviolet-visible light-near infrared can be obtained by the preparation method of the present invention. For 3D spacer fabrics, if only a high ultraviolet reflective coating is coated on its surface without making a hygroscopic coating, such as Control Example 1, the "water absorption valley" or "water peak" required for wide-band hyperspectral snow camouflage cannot be generated; conversely, if only a hygroscopic coating is made without applying a high ultraviolet reflective coating, such as Control Example 2, the "high ultraviolet reflective area" required for wide-band hyperspectral snow camouflage cannot be generated.

[0343] By comparing the spectral curves of Example 1 with those of Reference Examples 3, 4, 5, and 6, it can be seen that for ordinary fabrics, even if a hygroscopic coating is made on the surface thereof and then a high ultraviolet reflective coating is made, the superposition of high reflective and near-infrared "water peak" spectra cannot be achieved, and the compatibility effect of high ultraviolet reflective and "water peak" simulation cannot be achieved. This is because the presence of a large amount of water molecules will reduce the reflectivity in the ultraviolet region, and the particles of the high ultraviolet reflective coating have a certain water absorption capacity. After absorbing water, the particles are deteriorated and the "water peak" is lost. Therefore, it is necessary to design the structure of the fabric. The present invention utilizes the fabric structure of the 3D spacer fabric to properly separate the "ultraviolet reflective layer" and the "water peak simulation layer", reduce the mutual influence between the two, and make them work together to simulate a wide-band snow spectrum curve covering ultraviolet-visible light-near infrared.

[0344] The embodiments provided above are not intended to limit the scope of the present invention, and the steps described are not intended to limit the execution order thereof. Those skilled in the art may make obvious improvements to the present invention in combination with existing common knowledge, which also fall within the scope of protection defined by the claims of the present invention.

Claims

1. A wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared, characterized in that: The fabric includes a high ultraviolet reflective coating and a 3D spacer fabric layer impregnated with a hygroscopic coating, the raw materials of the high ultraviolet reflective coating include polyvinyl alcohol and an inorganic white powdered pigment, and the hygroscopic coating includes a polymer coating and a water-absorbent metal salt layer; wherein the inorganic white powdered pigment includes one or more of nano magnesium oxide, nano aluminum oxide, nano silicon dioxide, and barium sulfate, the raw materials of the polymer coating include one or more of sodium alginate, sodium polyacrylate, sodium phosphorylated dextran, carboxylated modified cellulose, carboxylated modified sodium alginate, chitosan, and polyvinyl alcohol, and the water-absorbent metal salt includes one or more of chlorides, sulfates, carbonates, and nitrates of calcium ions, zinc ions, and aluminum ions.

2. The wide-band hyperspectral snow camouflage fabric according to claim 1, characterized in that: The fabric comprises a high ultraviolet reflective coating, a 3D spacer fabric layer impregnated with a hygroscopic coating and a high ultraviolet reflective coating, and the fabric of the 3D spacer fabric comprises pure cotton, polyester, nylon, and polyester-cotton blended fabric.

3. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: The high ultraviolet reflective coating is prepared by mixing a polyvinyl alcohol aqueous solution and an inorganic white powdered pigment, and coating the high ultraviolet reflective coating on the surface of the 3D spacer fabric. The coating method includes at least one of spraying, calendering, and roller coating.

4. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: The mass fraction of the polyvinyl alcohol aqueous solution is 1-5%, and the number average molecular weight of the polyvinyl alcohol is 50,000-150,000.

5. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: The thickness of the high ultraviolet reflective coating is 0.01-5 nm.

6. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: In the high ultraviolet reflective coating, the particle size of the nano magnesium oxide is 20 to 50 nm, the particle size of the nano aluminum oxide is 10 to 50 nm, the particle size of the nano silicon dioxide is 10 to 50 nm, and the particle size of the barium sulfate is 200 to 500 nm.

7. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: In the high ultraviolet reflective coating, the mass ratio of the inorganic white powdered pigment to the polyvinyl alcohol aqueous solution is 1:25 to 1:

1.

8. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: The preparation method of the polyvinyl alcohol aqueous solution is as follows: pouring polyvinyl alcohol into water with a temperature of 60-90° C., keeping the water warm, stirring the water sufficiently to make the polyvinyl alcohol fully and evenly dissolved, and then cooling the water to 30° C.

9. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: The hygroscopic coating is obtained by first soaking the 3D spacer fabric in an aqueous solution of a polymer coating to prepare the polymer coating, drying it, and then soaking it in an absorbent metal salt aqueous solution to carry out a cross-linking reaction.

10. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: The mass fraction of the polymer coating in the aqueous solution of the polymer coating is 5-30%, and the thickness of the polymer coating is 0.01-5 nm.

11. The wide-band hyperspectral snow camouflage fabric according to claim 1 or 2, characterized in that: The mass fraction of the water-absorbent metal salt in the water solution of the water-absorbent metal salt is 10-50%, and the thickness of the water-absorbent metal salt layer is 0.01-5 nm.

12. A method for preparing a wide-band hyperspectral snow camouflage fabric compatible with ultraviolet-visible light-near infrared according to any one of claims 1 to 11, characterized in that: The following steps are involved: (1) Preparation of high ultraviolet reflective coating: adding an inorganic white powdered pigment to a polyvinyl alcohol aqueous solution and stirring the mixture to obtain a high ultraviolet reflective coating; (2) Preparation of a hygroscopic coating reaction solution: preparing a 5-30% by mass aqueous solution of a polymer coating and a 10-50% by mass aqueous solution of a water-absorbent metal salt; (3) Preparation of water-absorbent transparent coating: The 3D spacer fabric is first immersed in an aqueous solution of a polymer coating, immersed for 30 to 60 minutes, and then dried in an oven at 60°C; then the fabric containing the polymer coating is immersed in a water-absorbent metal salt aqueous solution, cross-linked at 20 to 30°C for 30 to 60 minutes, and then dried; (4) Preparation of high UV reflective coating: Apply high UV reflective coating on the surface of the hygroscopic coating and subject it to constant humidity treatment to obtain snow camouflage fabric.

13. The preparation method according to claim 12, characterized in that: The polymer coating is sodium alginate, and the water-absorbent metal salt is calcium chloride.

14. The preparation method according to claim 12, characterized in that: In step (4), the constant humidity treatment is to balance the fabric coated with the high ultraviolet reflective coating under a humidity condition of 60 to 90% for 2 to 5 hours.

15. Use of the wide-band hyperspectral snow camouflage fabric according to any one of claims 1 to 11 in the field of snow camouflage.

16. The use according to claim 15, characterized in that The applications include camouflage for military machinery and preparation of camouflage nets, combat uniforms, tank armor, information cabins and bunkers in individual combat.

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